Europe : France, United Kingdom
- Europe : United Kingdom
- Europe : Greece
- Europe : Italy
- Europe : Switzerland
- America : United States (New England)
- Europe : Belgium
- Northwestern UniversityAmerica : United States (Great Lakes)
- Българска академия на наукитеEurope : Bulgaria
- Asia : Taiwan
- Europe : France (Paris Île-de-France)
- America : Canada